2018 CSAT, all questions

UPSC Prelims 2018 · CSAT

Question 21: Logical Reasoning and Mental Ability

If LSJXVC is the code for MUMBAI, the code for DELHI is

aCCIDD
bCDKGH
cCCJFG
dCCIFE

AnswerUPSC’s answer is (a).

Compare MUMBAI with LSJXVC letter by letter: M to L is 1 step back, U to S is 2 back, M to J is 3 back, B to X is 4 back (wrapping past A), A to V is 5 back, I to C is 6 back. So each letter moves back by its position number: 1, 2, 3, and so on. For DELHI: D-1 = C, E-2 = C, L-3 = I, H-4 = D, I-5 = D, which gives CCIDD.

Why each option is right or wrong
  • (a) Correct: D-1, E-2, L-3, H-4, I-5 give C, C, I, D, D.
  • (b) Second letter should be E-2 = C, not D.
  • (c) Third letter should be L-3 = I, not J.
  • (d) Fourth letter should be H-4 = D, not F.

Answer: UPSC’s key. Explanation: written by UPSC Grade, not by UPSC.

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Source: UPSC, Civil Services (Preliminary) Examination 2018, General Studies Paper II (CSAT), Series A. The paper on upsc.gov.in.